US20130127795A1 - Display apparatus and control method thereof - Google Patents

Display apparatus and control method thereof Download PDF

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Publication number
US20130127795A1
US20130127795A1 US13/366,366 US201213366366A US2013127795A1 US 20130127795 A1 US20130127795 A1 US 20130127795A1 US 201213366366 A US201213366366 A US 201213366366A US 2013127795 A1 US2013127795 A1 US 2013127795A1
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United States
Prior art keywords
control
noise
display
display apparatus
signal
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Abandoned
Application number
US13/366,366
Inventor
Chih-Yung Hsu
Kai-I Dai
Ying-Neng Huang
Wan-Ju Chang
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Novatek Microelectronics Corp
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Novatek Microelectronics Corp
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Assigned to NOVATEK MICROELECTRONICS CORP. reassignment NOVATEK MICROELECTRONICS CORP. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CHANG, WAN-JU, DAI, KAI-I, HSU, CHIH-YUNG, HUANG, YING-NENG
Priority to US13/492,328 priority Critical patent/US8907939B2/en
Publication of US20130127795A1 publication Critical patent/US20130127795A1/en
Abandoned legal-status Critical Current

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3648—Control of matrices with row and column drivers using an active matrix
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/04—Maintaining the quality of display appearance
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/06—Handling electromagnetic interferences [EMI], covering emitted as well as received electromagnetic radiation
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/08—Fault-tolerant or redundant circuits, or circuits in which repair of defects is prepared
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/12—Test circuits or failure detection circuits included in a display system, as permanent part thereof

Definitions

  • the present invention generally relates to a display apparatus and a control method thereof, in particular, to a display apparatus capable of maintaining an image displayed before influence and a control method thereof.
  • display apparatuses are applied in may applications, such as television screens, computer screens, electronic-book readers, tablet computers, and mobile phones.
  • visual presentation provided by a display apparatus, it is easier and more convenient for a user to obtain information.
  • mobile apparatuses a lot of information including movies, television programs, short videos, webpage information, and electronic books can be viewed more rapidly and conveniently.
  • a display apparatus displays a corresponding image according to a received signal.
  • a signal received by the display apparatus may be incorrect, which makes an image presented by the display apparatus be different from the expected one, thereby affecting experience of a viewing user.
  • the display apparatus is more likely to be influenced by a noise, so that how to control the operation of the display apparatus being influenced by a noise is a big issue.
  • the present invention is directed to a display apparatus capable of maintaining an image displayed before influence and a control method thereof.
  • the present invention provides a control method of a display apparatus.
  • the control method includes detecting a noise influencing the display apparatus.
  • the control method further includes: when the noise is detected, generating a detection signal in response to the detected noise.
  • the control method further includes: maintaining an image displayed by the display apparatus according to the detection signal until the noise disappears.
  • the present invention provides a display apparatus.
  • the display apparatus includes a display panel, a detection circuit, and a control circuit.
  • the display panel is configured to display images.
  • the detection circuit is configured to detect a noise influencing the display apparatus, and generate a detection signal in response to the noise when the noise is detected.
  • the control circuit is coupled to the detection circuit and the display panel, and configured to maintain an image displayed by the display panel according to the detection signal until the noise disappears.
  • the noise is an electrostatic noise
  • the detection circuit is an electrostatic discharge (ESD) circuit and configured to detect the electrostatic noise.
  • ESD electrostatic discharge
  • the ESD circuit generates the detection signal in response to the detected electrostatic noise.
  • the display apparatus operates according to a plurality of control signals.
  • the detection circuit detects whether waveforms of the control signals are consistent with specific formats. If the waveform of any control signal is not consistent with the specific format, the detection circuit judges that the display apparatus is influenced by a noise, and generates a detection signal.
  • the display panel includes a plurality of data lines, a plurality of scan lines, a plurality of control units, and a plurality of display units.
  • a control terminal of each control unit is coupled to a corresponding scan line
  • an input terminal of each control unit is coupled to a corresponding data line
  • an output terminal of each control unit is coupled to a corresponding display unit.
  • the control circuit includes a timing control circuit, a source drive circuit, and a gate drive circuit.
  • the timing control circuit is configured to generate a source control signal and a gate control signal.
  • the source drive circuit is coupled to the timing control circuit and the display panel, and configured to output display signals to the input terminals of the control units through the data lines according to the source control signal.
  • the gate drive circuit is coupled to the timing control circuit and the display panel, and configured to output a scan signal to the control terminals of the control units through the scan lines according to the gate control signal.
  • the detection circuit detects the noise
  • the source drive circuit temporarily stops outputting the display signals to the input terminals of the control units
  • the gate drive circuit temporarily stops outputting the scan signal to the control terminals of the control units.
  • the source drive circuit receives a video signal, and converts the video signal into the display signals.
  • the detection circuit detects the noise
  • the source drive circuit temporarily stops receiving the video signal.
  • the source drive circuit in a first scan cycle in a first image frame cycle after the noise disappears, continues to receive the video signal, and converts the video signal into the display signals.
  • the display apparatus of the present invention detects whether the display apparatus is influenced by a noise through the detection circuit thereof.
  • the display apparatus is influenced by the noise, an image displayed before the display apparatus is influenced by the noise is maintained until the noise disappears. In this way, a user is prevented from viewing abnormally displayed images.
  • FIG. 1 is a function block diagram of a display apparatus according to an embodiment of the present invention.
  • FIG. 2 is a flow chart of a control method of a display apparatus according to an embodiment of the present invention.
  • FIG. 3 is a circuit diagram of a display panel of a display apparatus according to an embodiment of the present invention.
  • FIG. 4 is a timing diagram of a source control signal and a gate control signal when a display apparatus is not influenced by any noise according to an embodiment of the present invention.
  • FIG. 5 is a timing diagram of a source control signal and a gate control signal when a display apparatus is influenced by a noise according to an embodiment of the present invention.
  • FIG. 6 is a timing diagram of a source control signal and a gate control signal when a noise influencing a display apparatus disappears according to an embodiment of the present invention.
  • FIG. 1 is a function block diagram of a display apparatus 100 according to an embodiment of the present invention.
  • the display apparatus 100 includes a display panel 110 , a detection circuit 120 , and a control circuit 130 .
  • the display panel 110 is configured to display images.
  • the detection circuit 120 is configured to detect a noise S N influencing the display apparatus 100 , and generate a detection signal S D in response to the noise S N when the noise S N is detected.
  • the control circuit 130 is coupled to the detection circuit 120 and the display panel 110 , and is configured to maintain an image displayed by the display panel 110 according to the detection signal S D until the noise S N disappears. In this way, when the display apparatus 100 is influenced by a noise, the display panel 110 can keep displaying an image displayed before the influence.
  • the noise S N is an electrostatic noise
  • the detection circuit 120 is an ESD circuit and configured to detect the electrostatic noise S N .
  • the ESD circuit 120 generates the detection signal S D in response to the detected electrostatic noise S N .
  • the noise S N may be a noise in forms besides the electrostatic noise, and the present invention is not limited thereto.
  • the noise S N may also be an electromagnetic wave noise or a magnetic field noise.
  • FIG. 2 is a flow chart of a control method of a display apparatus according to an embodiment of the present invention.
  • the detection circuit 120 detects a noise S N influencing the display apparatus 100 .
  • Step S 220 it is judged whether the noise S N is detected. If the detection circuit 120 does not detect any noise influencing the display apparatus 100 , the procedure proceeds to Step S 210 , so that the detection circuit 120 continues to detect a noise influencing the display apparatus 100 . Otherwise, if the detection circuit 120 detects the noise S N influencing the display apparatus 100 , the procedure proceeds to Step 230 , so that a detection signal S D is generated based on the detected electrostatic noise S N .
  • Step 5240 the control circuit 130 maintains an image displayed by the display panel 110 according to the detection signal S D .
  • Step S 250 the control circuit 130 judges whether the noise S N disappears according to the detection signal S D generated by the detection circuit 120 . If it is judged in Step S 250 that the noise S N does not disappear, the control circuit 130 continues controlling the display panel 110 to make the display panel 110 maintain the displayed image; otherwise, if it is judged in Step S 250 that the noise S N already disappears, the procedure proceeds to Step S 260 , the control circuit 130 returns to a normal control mode to make the display panel 110 returns to a normal display mode.
  • FIG. 3 is a circuit diagram of a display panel 100 of a display apparatus according to an embodiment of the present invention.
  • the display panel 110 includes a plurality of data lines D 1 to D M , a plurality of scan lines G 1 to G N , a plurality of control units 112 , and a plurality of display units 114 .
  • a control terminal T C of each control unit 112 is coupled to a corresponding scan line
  • an input terminal T 1 of each control unit 112 is coupled to a corresponding data line
  • an output terminal T O of each control unit 112 is coupled to a corresponding display unit 114 .
  • the display panel 110 is a Liquid Crystal Display (LCD) panel
  • the control unit 112 is Thin-Film Transistor (TFT)
  • the display unit 114 is a pixel having liquid crystal molecules.
  • the control terminal T C of the control unit 112 is a gate.
  • the input terminal T I of the control unit 112 is a source.
  • the output terminal T O of the control unit 112 is a drain.
  • an LCD is taken as an example of the display apparatus in the aforementioned embodiments
  • the present invention may also be applied in other display apparatuses, such as a plasma display and a Cathode Ray Tube (CRT) monitor.
  • CTR Cathode Ray Tube
  • the control circuit 130 includes a timing control circuit 140 , a source drive circuit 150 , and a gate drive circuit 160 .
  • the timing control circuit 140 is configured to generate a source control signal LD and a gate control signal OEV.
  • the source drive circuit 150 is coupled to the timing control circuit 140 and the display panel 110 .
  • the gate drive circuit 160 is coupled to the timing control circuit 140 and the display panel 110 .
  • the source drive circuit 150 receives a video signal D D according to the source control signal LD generated by a timing control circuit 140 , and converts the video signal D D into display signals D S .
  • the source drive circuit 150 outputs the display signals D S to the input terminals T I of the control units 112 through the data lines D 1 to D M . Further, the gate drive circuit 160 outputs a scan signal S G to the control terminals T C of the control units 112 in sequence through the scan lines G 1 to G N according to the gate control signal OEV generated by the timing control circuit 140 .
  • the scan signal S G is of high potential
  • the control unit 112 is turned on, so that the display unit 114 receives the display signal D S from the source drive circuit 150 , and presents a corresponding display state in response to the received display signal D S .
  • the display signals received by the display units 114 are represented by the same symbol, namely Ds, the display signals D S received by the display units 114 may be different from one another, so that different display states may be presented.
  • the detection circuit 120 detects the noise S N
  • the source drive circuit 150 temporarily stops outputting the display signals D S to the input terminals T I of the control units 112
  • the gate drive circuit 160 temporarily stops outputting the scan signal S G to the control terminals T C of the control units 112 .
  • the display panel 110 can keep displaying an image displayed before the influence.
  • the source drive circuit 150 when the detection circuit 120 detects the noise S N , the source drive circuit 150 temporarily stops receiving the video signal D D .
  • the display apparatus 100 performs an operation thereof according to a plurality of control signals.
  • the plurality of control signals includes a horizontal synchronization signal Hsync, a vertical synchronization signal Vsync, and a data enable signal DE.
  • the control signals are consistent with corresponding specific formats respectively, so that the display apparatus 100 can operate accordingly.
  • the detection circuit 120 detects whether waveforms of the control signals are consistent with the corresponding specific formats thereof. If the waveform of any control signal is not consistent with the corresponding specific format, the detection circuit 120 judges that the display apparatus 100 is influenced by a noise, and therefore generates the detection signal S D .
  • FIG. 4 is a timing diagram of the source control signal LD and the gate control signal OEV when the display apparatus 100 is not influenced by the noise S N according to an embodiment of the present invention.
  • the source control signal LD is of high potential
  • the source drive circuit 150 receives the video signal D D , and converts the video signal D D into display signals D S .
  • the gate control signal OEV is of low potential
  • the gate drive circuit 160 sends the scan signal S G to the control terminals T C of the control units 112 through the scan lines G 1 to G N , so as to turn on the control units 112 .
  • the source drive circuit 150 when the source control signal LD is of low potential, the source drive circuit 150 temporarily stops receiving the video signal D D , and stops converting the video signal D D into the display signals D S .
  • the gate control signal OEV is of high potential, the gate drive circuit 160 stops sending the scan signal S G to the control terminals T C of the control units 112 .
  • FIG. 4 shows three image frame cycles F A to F A+2 . Further, each of the image frame cycles F A to F A+2 is divided into a plurality of scan cycles L 1 to L N . In the scan cycles L 1 to L N , the gate drive circuit 160 transmits the scan signal S G to corresponding scan lines G 1 to G N , so as to update the display states of the display units 114 connected to the scan lines.
  • the display state of the display unit 114 connected to the scan line G 1 is updated; in the scan cycle L 2 , the display state of the display unit 114 connected to the scan line G 2 is updated; in the scan cycle L N , the display state of the display unit 114 connected to the scan line G N is updated, and so on.
  • FIG. 5 is a timing diagram of the source control signal LD and the gate control signal OEV when the display apparatus 100 is influenced by the noise S N according to an embodiment of the present invention.
  • FIG. 5 shows three other image frame cycles F B to F B+2 .
  • the detection circuit 120 detects the noise S N influencing the display apparatus 100 , and therefore generates the detection signal S D .
  • the timing control circuit 140 receives the detection signal S D , therefore makes the source control signal LD maintain low potential after the scan cycle L X , and makes the gate control signal OEV maintain high potential in scan cycles after the scan cycle L X . In this way, after the scan cycle L X , updating of the display states of all of the display units 114 is stopped, so as to make the display panel 110 maintain the image displayed before the influence.
  • FIG. 6 is a timing diagram of the source control signal LD and the gate control signal OEV when the noise influencing the display apparatus 100 disappears according to an embodiment of the present invention.
  • FIG. 6 shows three other image frame cycles F C to F C+2 .
  • the detection circuit 120 detects that the noise S N influencing the display apparatus 100 disappears.
  • the source control signal LD maintains low potential
  • the gate control signal OEV maintains high potential.
  • the control circuit 130 returns to the normal control mode, so as to raise the potential of the source control signal LD to the high potential and lower the potential of the gate control signal OEV to the low potential. Therefore, in the first scan cycle L 1 in the first image frame cycle (the image frame cycle F C+1 ) after the noise S N disappears, the source drive circuit 150 continues to receive the video signal D D , and converts the video signal D D into the display signals D S , and the gate drive circuit 160 continues to output the scan signal S G to the control terminals T C of the control units 112 .
  • control circuit 130 continues to update the display states of the display units 114 , so as to update the image displayed by the display panel 110 .
  • the control circuit 130 returns to the normal control mode in the first scan cycle in the first image frame cycle after the noise S N disappears, so that after returning to the normal display mode the display panel 110 can display normal and complete images.
  • the display apparatus of the present invention detects whether the display apparatus is influenced by a noise through the detection circuit thereof When the display apparatus is influenced by the noise, an image which is displayed before the display apparatus is influenced by the noise is maintained until the noise disappears. In this way, a user is prevented from viewing abnormally displayed images.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal Display Device Control (AREA)

Abstract

A display apparatus and a control method thereof are provided. The display apparatus includes a display panel, a detection circuit, and a control circuit. The display panel is configured to display images. The detection circuit is configured to detect a noise influencing a display apparatus, and generate a detection signal in response to the noise when the noise is detected. The control circuit is coupled to the detection circuit and the display panel, and configured to maintain an image displayed by the display panel according to the detection signal until the noise disappears. In this way, when the display apparatus is influenced by a noise, the display panel can keep displaying an image displayed before the influence.

Description

    CROSS-REFERENCE TO RELATED APPLICATION
  • This application claims the priority benefit of Taiwan application serial no. 100142685, filed on Nov. 22, 2011. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification.
    • BACKGROUND OF THE INVENTION
  • 1. Field of the Invention
  • The present invention generally relates to a display apparatus and a control method thereof, in particular, to a display apparatus capable of maintaining an image displayed before influence and a control method thereof.
  • 2. Description of Related Art
  • With the coming of the information age, display apparatuses are applied in may applications, such as television screens, computer screens, electronic-book readers, tablet computers, and mobile phones. In addition, by the visual presentation provided by a display apparatus, it is easier and more convenient for a user to obtain information. Further, with the popularization of mobile apparatuses, a lot of information including movies, television programs, short videos, webpage information, and electronic books can be viewed more rapidly and conveniently.
  • Generally speaking, a display apparatus displays a corresponding image according to a received signal. However, when a noise exists, a signal received by the display apparatus may be incorrect, which makes an image presented by the display apparatus be different from the expected one, thereby affecting experience of a viewing user. In addition, with the environment of use becoming complex, the display apparatus is more likely to be influenced by a noise, so that how to control the operation of the display apparatus being influenced by a noise is a big issue.
    • SUMMARY OF THE INVENTION
  • Accordingly, the present invention is directed to a display apparatus capable of maintaining an image displayed before influence and a control method thereof.
  • The present invention provides a control method of a display apparatus. The control method includes detecting a noise influencing the display apparatus. The control method further includes: when the noise is detected, generating a detection signal in response to the detected noise. The control method further includes: maintaining an image displayed by the display apparatus according to the detection signal until the noise disappears.
  • The present invention provides a display apparatus. The display apparatus includes a display panel, a detection circuit, and a control circuit. The display panel is configured to display images. The detection circuit is configured to detect a noise influencing the display apparatus, and generate a detection signal in response to the noise when the noise is detected. The control circuit is coupled to the detection circuit and the display panel, and configured to maintain an image displayed by the display panel according to the detection signal until the noise disappears.
  • In an embodiment of the present invention, the noise is an electrostatic noise, and the detection circuit is an electrostatic discharge (ESD) circuit and configured to detect the electrostatic noise. The ESD circuit generates the detection signal in response to the detected electrostatic noise.
  • In an embodiment of the present invention, the display apparatus operates according to a plurality of control signals. The detection circuit detects whether waveforms of the control signals are consistent with specific formats. If the waveform of any control signal is not consistent with the specific format, the detection circuit judges that the display apparatus is influenced by a noise, and generates a detection signal.
  • In an embodiment of the present invention, the display panel includes a plurality of data lines, a plurality of scan lines, a plurality of control units, and a plurality of display units. A control terminal of each control unit is coupled to a corresponding scan line, an input terminal of each control unit is coupled to a corresponding data line, and an output terminal of each control unit is coupled to a corresponding display unit. The control circuit includes a timing control circuit, a source drive circuit, and a gate drive circuit. The timing control circuit is configured to generate a source control signal and a gate control signal. The source drive circuit is coupled to the timing control circuit and the display panel, and configured to output display signals to the input terminals of the control units through the data lines according to the source control signal. The gate drive circuit is coupled to the timing control circuit and the display panel, and configured to output a scan signal to the control terminals of the control units through the scan lines according to the gate control signal. When the detection circuit detects the noise, the source drive circuit temporarily stops outputting the display signals to the input terminals of the control units, and the gate drive circuit temporarily stops outputting the scan signal to the control terminals of the control units.
  • In an embodiment of the present invention, the source drive circuit receives a video signal, and converts the video signal into the display signals. When the detection circuit detects the noise, the source drive circuit temporarily stops receiving the video signal.
  • In an embodiment of the present invention, in a first scan cycle in a first image frame cycle after the noise disappears, the source drive circuit continues to receive the video signal, and converts the video signal into the display signals.
  • In view of the above, the display apparatus of the present invention detects whether the display apparatus is influenced by a noise through the detection circuit thereof. When the display apparatus is influenced by the noise, an image displayed before the display apparatus is influenced by the noise is maintained until the noise disappears. In this way, a user is prevented from viewing abnormally displayed images.
  • In order to make the aforementioned features and advantages of the present invention more comprehensible, embodiments are described in detail below with the accompanying drawings.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.
  • FIG. 1 is a function block diagram of a display apparatus according to an embodiment of the present invention.
  • FIG. 2 is a flow chart of a control method of a display apparatus according to an embodiment of the present invention.
  • FIG. 3 is a circuit diagram of a display panel of a display apparatus according to an embodiment of the present invention.
  • FIG. 4 is a timing diagram of a source control signal and a gate control signal when a display apparatus is not influenced by any noise according to an embodiment of the present invention.
  • FIG. 5 is a timing diagram of a source control signal and a gate control signal when a display apparatus is influenced by a noise according to an embodiment of the present invention.
  • FIG. 6 is a timing diagram of a source control signal and a gate control signal when a noise influencing a display apparatus disappears according to an embodiment of the present invention.
    •  DESCRIPTION OF THE EMBODIMENTS
  • Reference will now be made in detail to the present embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers are used in the drawings and the description to refer to the same or like parts.
  • Referring to FIG. 1, FIG. 1 is a function block diagram of a display apparatus 100 according to an embodiment of the present invention. The display apparatus 100 includes a display panel 110, a detection circuit 120, and a control circuit 130. The display panel 110 is configured to display images. The detection circuit 120 is configured to detect a noise SN influencing the display apparatus 100, and generate a detection signal SD in response to the noise SN when the noise SN is detected. The control circuit 130 is coupled to the detection circuit 120 and the display panel 110, and is configured to maintain an image displayed by the display panel 110 according to the detection signal SD until the noise SN disappears. In this way, when the display apparatus 100 is influenced by a noise, the display panel 110 can keep displaying an image displayed before the influence.
  • In an embodiment of the present invention, the noise SN is an electrostatic noise, and the detection circuit 120 is an ESD circuit and configured to detect the electrostatic noise SN. The ESD circuit 120 generates the detection signal SD in response to the detected electrostatic noise SN. It should be understood that the noise SN may be a noise in forms besides the electrostatic noise, and the present invention is not limited thereto. For example, the noise SN may also be an electromagnetic wave noise or a magnetic field noise.
  • Referring to FIG. 2, FIG. 2 is a flow chart of a control method of a display apparatus according to an embodiment of the present invention. In Step S210, the detection circuit 120 detects a noise SN influencing the display apparatus 100. Then, in Step S220, it is judged whether the noise SN is detected. If the detection circuit 120 does not detect any noise influencing the display apparatus 100, the procedure proceeds to Step S210, so that the detection circuit 120 continues to detect a noise influencing the display apparatus 100. Otherwise, if the detection circuit 120 detects the noise SN influencing the display apparatus 100, the procedure proceeds to Step 230, so that a detection signal SD is generated based on the detected electrostatic noise SN. Then, in Step 5240, the control circuit 130 maintains an image displayed by the display panel 110 according to the detection signal SD. Further, in Step S250, the control circuit 130 judges whether the noise SN disappears according to the detection signal SD generated by the detection circuit 120. If it is judged in Step S250 that the noise SN does not disappear, the control circuit 130 continues controlling the display panel 110 to make the display panel 110 maintain the displayed image; otherwise, if it is judged in Step S250 that the noise SN already disappears, the procedure proceeds to Step S260, the control circuit 130 returns to a normal control mode to make the display panel 110 returns to a normal display mode.
  • Referring to FIG. 3, FIG. 3 is a circuit diagram of a display panel 100 of a display apparatus according to an embodiment of the present invention. The display panel 110 includes a plurality of data lines D1 to DM, a plurality of scan lines G1 to GN, a plurality of control units 112, and a plurality of display units 114. A control terminal TC of each control unit 112 is coupled to a corresponding scan line, an input terminal T1 of each control unit 112 is coupled to a corresponding data line, and an output terminal TO of each control unit 112 is coupled to a corresponding display unit 114. In an embodiment of the present invention, the display panel 110 is a Liquid Crystal Display (LCD) panel, the control unit 112 is Thin-Film Transistor (TFT), and the display unit 114 is a pixel having liquid crystal molecules. The control terminal TC of the control unit 112 is a gate. The input terminal TI of the control unit 112 is a source. The output terminal TO of the control unit 112 is a drain.
  • It should be understood that, although an LCD is taken as an example of the display apparatus in the aforementioned embodiments, the present invention may also be applied in other display apparatuses, such as a plasma display and a Cathode Ray Tube (CRT) monitor.
  • Referring to FIG. 1, in an embodiment of the present invention, the control circuit 130 includes a timing control circuit 140, a source drive circuit 150, and a gate drive circuit 160. The timing control circuit 140 is configured to generate a source control signal LD and a gate control signal OEV. The source drive circuit 150 is coupled to the timing control circuit 140 and the display panel 110. The gate drive circuit 160 is coupled to the timing control circuit 140 and the display panel 110. Referring to FIG. 1 and FIG. 3, when the display apparatus 100 operates in the normal display mode, the source drive circuit 150 receives a video signal DD according to the source control signal LD generated by a timing control circuit 140, and converts the video signal DD into display signals DS. The source drive circuit 150 outputs the display signals DS to the input terminals TI of the control units 112 through the data lines D1 to DM. Further, the gate drive circuit 160 outputs a scan signal SG to the control terminals TC of the control units 112 in sequence through the scan lines G1 to GN according to the gate control signal OEV generated by the timing control circuit 140. When the scan signal SG is of high potential, the control unit 112 is turned on, so that the display unit 114 receives the display signal DS from the source drive circuit 150, and presents a corresponding display state in response to the received display signal DS. It should be understood that, although the display signals received by the display units 114 are represented by the same symbol, namely Ds, the display signals DS received by the display units 114 may be different from one another, so that different display states may be presented. Further, when the detection circuit 120 detects the noise SN, the source drive circuit 150 temporarily stops outputting the display signals DS to the input terminals TI of the control units 112, and the gate drive circuit 160 temporarily stops outputting the scan signal SG to the control terminals TC of the control units 112. In this way, the display panel 110 can keep displaying an image displayed before the influence. Further, in an embodiment of the present invention, when the detection circuit 120 detects the noise SN, the source drive circuit 150 temporarily stops receiving the video signal DD.
  • In an embodiment of the present invention, the display apparatus 100 performs an operation thereof according to a plurality of control signals. For example, the plurality of control signals includes a horizontal synchronization signal Hsync, a vertical synchronization signal Vsync, and a data enable signal DE. The control signals are consistent with corresponding specific formats respectively, so that the display apparatus 100 can operate accordingly. The detection circuit 120 detects whether waveforms of the control signals are consistent with the corresponding specific formats thereof. If the waveform of any control signal is not consistent with the corresponding specific format, the detection circuit 120 judges that the display apparatus 100 is influenced by a noise, and therefore generates the detection signal SD.
  • Referring to FIG. 1, FIG. 3, and FIG. 4, FIG. 4 is a timing diagram of the source control signal LD and the gate control signal OEV when the display apparatus 100 is not influenced by the noise SN according to an embodiment of the present invention. When the source control signal LD is of high potential, the source drive circuit 150 receives the video signal DD, and converts the video signal DD into display signals DS. When the gate control signal OEV is of low potential, the gate drive circuit 160 sends the scan signal SG to the control terminals TC of the control units 112 through the scan lines G1 to GN, so as to turn on the control units 112. Correspondingly, when the source control signal LD is of low potential, the source drive circuit 150 temporarily stops receiving the video signal DD, and stops converting the video signal DD into the display signals DS. When the gate control signal OEV is of high potential, the gate drive circuit 160 stops sending the scan signal SG to the control terminals TC of the control units 112.
  • When the display apparatus 100 operates, the timing is divided into a plurality of image frame cycles, and in each image frame cycle the display states of the display units 114 are updated once. FIG. 4 shows three image frame cycles FA to FA+2. Further, each of the image frame cycles FA to FA+2 is divided into a plurality of scan cycles L1 to LN. In the scan cycles L1 to LN, the gate drive circuit 160 transmits the scan signal SG to corresponding scan lines G1 to GN, so as to update the display states of the display units 114 connected to the scan lines. For example, in the scan cycle L1, the display state of the display unit 114 connected to the scan line G1 is updated; in the scan cycle L2, the display state of the display unit 114 connected to the scan line G2 is updated; in the scan cycle LN, the display state of the display unit 114 connected to the scan line GN is updated, and so on.
  • Referring to FIG. 1, FIG. 3, and FIG. 5, FIG. 5 is a timing diagram of the source control signal LD and the gate control signal OEV when the display apparatus 100 is influenced by the noise SN according to an embodiment of the present invention. FIG. 5 shows three other image frame cycles FB to FB+2. At a time point Ta within a scan cycle LX, the detection circuit 120 detects the noise SN influencing the display apparatus 100, and therefore generates the detection signal SD. The timing control circuit 140 receives the detection signal SD, therefore makes the source control signal LD maintain low potential after the scan cycle LX, and makes the gate control signal OEV maintain high potential in scan cycles after the scan cycle LX. In this way, after the scan cycle LX, updating of the display states of all of the display units 114 is stopped, so as to make the display panel 110 maintain the image displayed before the influence.
  • Referring to FIG. 1, FIG. 3, and FIG. 6, FIG. 6 is a timing diagram of the source control signal LD and the gate control signal OEV when the noise influencing the display apparatus 100 disappears according to an embodiment of the present invention. FIG. 6 shows three other image frame cycles FC to FC+2. Before the image frame cycle FC, the display apparatus 100 is influenced by the noise SN, but at a time point Tb within the scan cycle LC, the detection circuit 120 detects that the noise SN influencing the display apparatus 100 disappears. In scan cycles after the time point Tb and within the image frame cycle FC, the source control signal LD maintains low potential, and the gate control signal OEV maintains high potential. Then, after the noise SN disappears, in the first scan cycle L1 in the image frame cycle FC+1, the control circuit 130 returns to the normal control mode, so as to raise the potential of the source control signal LD to the high potential and lower the potential of the gate control signal OEV to the low potential. Therefore, in the first scan cycle L1 in the first image frame cycle (the image frame cycle FC+1) after the noise SN disappears, the source drive circuit 150 continues to receive the video signal DD, and converts the video signal DD into the display signals DS, and the gate drive circuit 160 continues to output the scan signal SG to the control terminals TC of the control units 112. In this way, after the image frame cycle FC+1, the control circuit 130 continues to update the display states of the display units 114, so as to update the image displayed by the display panel 110. The control circuit 130 returns to the normal control mode in the first scan cycle in the first image frame cycle after the noise SN disappears, so that after returning to the normal display mode the display panel 110 can display normal and complete images.
  • In view of the above, the display apparatus of the present invention detects whether the display apparatus is influenced by a noise through the detection circuit thereof When the display apparatus is influenced by the noise, an image which is displayed before the display apparatus is influenced by the noise is maintained until the noise disappears. In this way, a user is prevented from viewing abnormally displayed images.
  • It will be apparent to those skilled in the art that various modifications and variations can be made to the structure of the present invention without departing from the scope or spirit of the invention. In view of the foregoing, it is intended that the present invention cover modifications and variations of this invention provided they fall within the scope of the following claims and their equivalents.

Claims (12)

What is claimed is:
1. A control method of a display apparatus, comprising:
detecting a noise influencing the display apparatus;
when the noise is detected, generating a detection signal in response to the detected noise; and
maintaining an image displayed by the display apparatus according to the detection signal until the noise disappears.
2. The control method according to claim 1, wherein the noise is an electrostatic noise, and the step of detecting the noise influencing the display apparatus comprises:
using an electrostatic discharge (ESD) circuit to detect the electrostatic noise;
wherein the ESD circuit generates the detection signal in response to the detected electrostatic noise.
3. The control method according to claim 1, wherein the display apparatus operates according to a plurality of control signals, and the step of detecting the noise influencing the display apparatus comprises:
detecting whether waveforms of the control signals are consistent with specific formats;
wherein if the waveform of any one of the control signals is not consistent with the specific format, it is judged that the display apparatus is influenced by the noise, and the detection signal is generated.
4. The control method according to claim 1, wherein the display apparatus comprises:
a display panel, configured to display images and comprising a plurality of data lines, a plurality of scan lines, a plurality of control units, and a plurality of display units, wherein a control terminal of each control unit is coupled to a corresponding scan line, an input terminal of each control unit is coupled to a corresponding data line, and an output terminal of each control unit is coupled to a corresponding display unit;
a timing control circuit, configured to generate a source control signal and a gate control signal;
a source drive circuit, coupled to the timing control circuit and the display panel, and configured to output display signals to the input terminals of the control units through the data lines according to the source control signal; and
a gate drive circuit, coupled to the timing control circuit and the display panel, and configured to output a scan signal to the control terminals of the control units through the scan lines according to the gate control signal; and
wherein when the noise is detected, the source drive circuit temporarily stops outputting the display signals to the input terminals of the control units, and the gate drive circuit temporarily stops outputting the scan signal to the control terminals of the control units.
5. The control method according to claim 4, wherein the source drive circuit receives a video signal, and converts the video signal into the display signals, and when the noise is detected, the source drive circuit temporarily stops receiving the video signal.
6. The control method according to claim 5, wherein in a first scan cycle in a first image frame cycle after the noise disappears, the source drive circuit continues to receive the video signal, and converts the video signal into the display signals.
7. A display apparatus, comprising:
a display panel, configured to display images;
a detection circuit, configured to detect a noise influencing the display apparatus, and generate a detection signal in response to the noise when the noise is detected; and
a control circuit, coupled to the detection circuit and the display panel, and configured to maintain an image displayed by the display panel according to the detection signal until the noise disappears.
8. The display apparatus according to claim 7, wherein the noise is an electrostatic noise, the detection circuit is an electrostatic discharge (ESD) circuit configured to detect the electrostatic noise, and the ESD circuit generates the detection signal in response to the detected electrostatic noise.
9. The display apparatus according to claim 7, wherein the display apparatus operates according to a plurality of control signals, the detection circuit detects whether waveforms of the control signals are consistent with specific formats, and if the waveform of any one of the control signals is not consistent with the specific format, the detection circuit judges that the display apparatus is influenced by the noise, and generates the detection signal.
10. The display apparatus according to claim 7, wherein the display panel comprises a plurality of data lines, a plurality of scan lines, a plurality of control units, and a plurality of display units, a control terminal of each control unit is coupled to a corresponding scan line, an input terminal of each control unit is coupled to a corresponding data line, and an output terminal of each control unit is coupled to a corresponding display unit;
wherein the control circuit comprises:
a timing control circuit, configured to generate a source control signal and a gate control signal;
a source drive circuit, coupled to the timing control circuit and the display panel, and configured to output display signals to the input terminals of the control units through the data lines according to the source control signal; and
a gate drive circuit, coupled to the timing control circuit and the display panel, and configured to output a scan signal to the control terminals of the control units through the scan lines according to the gate control signal; and
wherein when the detection circuit detects the noise, the source drive circuit temporarily stops outputting the display signals to the input terminals of the control units, and the gate drive circuit temporarily stops outputting the scan signal to the control terminals of the control units.
11. The display apparatus according to claim 10, wherein the source drive circuit receives a video signal, and converts the video signal into the display signals, and when the detection circuit detects the noise, the source drive circuit temporarily stops receiving the video signal.
12. The display apparatus according to claim 11, wherein in a first scan cycle in a first image frame cycle after the noise disappears, the source drive circuit continues to receive the video signal, and converts the video signal into the display signals.
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